The World’s Online Notary

The World’s First and Only

Proofstack is the world’s first and only startup that uses both Qualified Authorities and Blockchain Protocols (BTC, ETH, LTC, EOS, NEO, XLM) in a single platform to create global and local legal proofs via Android, iOS and Web applications.

Techcrunch

Proofstack (formerly Copyrobo)
was elected as one of the 3 most promising blockchain startup.